Mobile telephone set



FIG. 1 is a front elevational view of a mobile telephone set showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right-side elevational view thereof; and

FIG. 6 is a left-side elevational view thereof. 

The ornamental design for a mobile telephone set, as shown. 